【摘要】 以十二胺(DDA)为模板剂,正硅酸四乙酯(TEOS)为硅源,以硝酸铬(Cr(NO3)3·9H2O)为铬源,钛酸四丁酯(TBOT)为钛源,偏铝酸钠(NaAlO2)为铝源,在一定条件下反应,分别制备了含杂原子Cr,Ti和Al的介孔HMS分子筛.采用粉末X-射线衍射(XRD)、紫外可见漫反射光谱(UV-Vis)、N2吸附—脱附及透射电镜(TEM)等手段对杂原子HMS分子筛进行了表征.XRD结果表明,Cr,Ti和Al杂原子分别嵌入到HMS分子筛骨架;N2吸附—脱附的孔径分布及TEM结果表明杂原子介孔分子筛孔径集中在4nm左右并具有蚯蚓状的孔道结构.更多还原

【Abstract】 HMSmolecular sieves containing Cr,Ti and Al heteroatoms with mesopore structure are synthesized using silica acid te-traethyl ester (TEOS) as Si source, chromium( Ⅲ ) nitrate (Cr(NO3)3·9H2O) as Cr source, sodium aluminateCNaAlO2)as Al source and tetrabutyl orthotitante (TBOT) as Ti source as well as dodecylamine (DDA) as template agent. The products are characterized by means of powder X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectrum, N2 adsorption - desorption and transmission electron microscopy (TEM). The results show that Cr, Ti and Al atoms are inlaid in HMS framework, the pore structure of these heteroatoms molecular sieves presents earthworms-shape and the pore diameter is about 4nm.更多还原